Method and apparatus for controlling qubits with single flux quantum logic

Abstract

In one embodiment, the disclosure relates to a method and apparatus for controlling the energy state of a qubit by bringing the qubit into and out of resonance by coupling the qubit to a flux quantum logic gate. The qubit can be in resonance with a pump signal, with another qubit or with some quantum logic gate. In another embodiment, the disclosure relates to a method for controlling a qubit with RSFQ logic or through the interface between RSFQ and the qubit.

Description

BACKGROUND[0001]The instant disclosure relates to U.S. application Ser. No. 11 / 654,632, filed Jan. 18, 2007, entitled “Single Flux Quantum Circuits”, and application Ser. No. 11 / 833,902, filed Aug. 3, 2007, entitled: “Arbitrary Quantum Operation with a Common Coupled Resonator”, both of which are incorporated herein in entirety for background information.[0002]1. Field of the Invention[0003]The disclosure generally relates to superconductor circuits and more particularly to superconductor circuits using Rapid Single Flux Quantum (RSFQ) logic and a method and apparatus for controlling the same.[0004]2. Description of Related Art[0005]A classical computer operates by processing binary bits of information that change state according to the laws of classical physics. These information bits can be modified by using simple logic gates such as AND and OR gates. The binary bits are physically created by a high or a low energy level occurring at the output of the logic gate to represent eith...

AI Technical Summary

Benefits of technology

The patent text describes various embodiments of apparatus and methods for controlling the resonance frequency of a qubit using an external electromagnetic field. The technical effects of the patent include the ability to control the energy state of a qubit, change its resonance frequency, and generate control signals for qubits hierarchically. These technologies have applications in quantum computing and communication.

Problems solved by technology

Conventionally, the Josephson Junction is supplied with a DC bias and the power budget in such circuits is dominated by static power consumption which happens whether or not the active device is switching.

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